US PATENT SUBCLASS 340 / 658
.~.~.~ Phase or frequency
Current as of:
June, 1999
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340 /
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COMMUNICATIONS: ELECTRICAL
500
DF
CONDITION RESPONSIVE INDICATING SYSTEM
{6}
540
DF
.~ Specific condition {18}
657
DF
.~.~ Electrical characteristic {4}
658
.~.~.~ Phase or frequency
DEFINITION
Classification: 340/658
Phase or frequency:
(under subclass 657) Subject matter where the monitored characteristic is electrical phase or frequency.
SEE OR SEARCH CLASS
324, Electricity: Measuring and Testing,
76.39+, and 76.77+ for frequency and phase measurement, respectively.